Malware on web pages won't go away even with re-install.
I'm just asking this so I can register !!!! I want to answer another problem that I solved.
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Well, just in case;
Further information can be found in the Troubleshoot Firefox issues caused by malware article.
Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.
I found your answer here: https://support.mozilla.org/questions/1055403#answer-759682
But speaking of security, the forum software detected your Firefox as version 27. Is that correct?
Version 27 is not secure; Mozilla discloses security flaws after each new release. Is something holding you back from upgrading to Firefox 39? Please let us know so we can suggest solutions or workarounds.
Perhaps this article addresses some of the reasons: How to make the new Firefox look like the old Firefox (from the time Firefox 29 was released).
If Help > About Firefox already shows Firefox 39.0, you may need to clear the preference that is misreporting your version number. See: How to reset the default user agent on Firefox.